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Definition of "Sling"

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This is such a Noob question, but what is a sling? I have searched for the definition in search engines and read through posts that looked like there might be a definition, but I cant find it anywhere. I thought it was like an eggsack? maybe freshly hatched ? Well anyway just a real quick answer would be appreciated. It has to be a "everybody but me knows but me" question because every sales site mentions it like everybody obviously knows the answer
Thanks for the help.
JeffK

In my interpretation, the sling stage (actually, spiderling is the full name and I think it sounds better) begins when the spider emerges from the eggsack. This usually means you have 2nd instars, 3rd instars in a few species.
Juveniles are basically young spiders that aren't mature yet and are smaller than the mature (adult) spiders. I guess you could call a spider juvenile at 2nd(/3rd) instar if you wanted to, but most people usually start to use the term juvenile after a spiderling molted a few times.

"But I shall certainly admit a system as empirical or scientific only if it is capable of being tested by experience. These considerations suggest that not the verifiability but the falsifiability of a system is to be taken as a criterion of demarcation. In other words: . . . it must be possible for an empirical scientific system to be refuted by experience." –K. R. Popper (1968: 40)

Generally, the terms sub-adult and juvie are synonomous. For an average sized T that will attain a diagonal leg span (or DLS) of about 5-7", I'd agree with Jairi and say that under 2" is a sling, 2-4" is a juvie / sub-adult, and anything over 4" is an adult.

<Formerly known as xsyorra>

Originally Posted by Pikaia

"Are you going to stand there and try to convince me that a one ounce spider just bamboozled you into wetting your pants?"